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Method for controlling DFIG without phase-locked ring under synchronous coordinate system

A technology of synchronous coordinate system and control method, which is applied in the direction of control system, control generator, vector control system, etc., and can solve the problems of increasing system design complexity and calculation burden

Active Publication Date: 2014-10-01
ZHEJIANG UNIV
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Problems solved by technology

Then, the control scheme is highly dependent on the accuracy of the phase angle obtained by the phase-locked loop, and in order to detect real-time phase angle information quickly and accurately, it is necessary to improve the phase-locked loop, which also increases the complexity of the system design and computational burden

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  • Method for controlling DFIG without phase-locked ring under synchronous coordinate system
  • Method for controlling DFIG without phase-locked ring under synchronous coordinate system
  • Method for controlling DFIG without phase-locked ring under synchronous coordinate system

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Embodiment Construction

[0045] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] This implementation mode takes a commercial DFIG with a capacity of 2.0MW and a rated voltage of 690V as an example; figure 2 The control method of the DFIG based on the synchronous coordinate system without phase-locked loop is given, including the following steps:

[0047] (1) First, use a set of (3) voltage Hall sensors 2 to collect the three-phase stator voltage u of DFIG sa ~ u sc , using a set of (3) current Hall sensors 3 to collect the three-phase stator current i of DFIG respectively sa ~i sc ;

[0048] Then, use the photoelectric encoder 5 to detect the rotational speed ω of DFIG according to the angular frequency ω=100π r and the rotor position angle θ r , and calculate the rotor slip angular frequency ω s =ω-ω r ;

[0049] Use...

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Abstract

The invention discloses a method for controlling a DFIG without a phase-locked ring under a synchronous coordinate system. After error adjustment and decoupling compensation are carried out on active power and inactive power outputted by the DFIG, a rotor voltage instruction is automatically generated so that a DFIG rotor current transformer can be controlled. A phase-locked loop link for extracting the positive sequence voltage amplitude by tracking the voltage phase angle is omitted, the designing procedure of a control system is simplified, and the computing burdens on the computer control system are effectively reduced. Meanwhile, the DFIG control method has good adaptability to frequency deviation and inaccurate motor parameters and can still provide good power tracking capability. The method can be applied to PWM converters for grid-connected power generation, alternating-current transmission and the like of new energy sources such as solar energy and biomass energy.

Description

technical field [0001] The invention belongs to the technical field of doubly-fed induction motor control, and in particular relates to a DFIG control method without a phase-locked loop in a synchronous coordinate system. Background technique [0002] Energy occupies a very important strategic position in the national economy. At present, my country's energy structure is irrational and its utilization efficiency is low. According to statistics in 2013, coal consumption in my country's energy structure accounts for 65.7% of primary energy consumption, and non-fossil energy consumption accounts for 9.8% of primary energy consumption. It is one of the few major energy-consuming countries dominated by coal. The consumption of a large amount of fossil energy has caused a large amount of carbon dioxide and sulfur dioxide emissions, leading to serious problems such as climate warming and environmental pollution. Therefore, my country is committed to optimizing the energy structure,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/14
Inventor 年珩程鹏
Owner ZHEJIANG UNIV
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